added 'suspend' button

mainwindow.cpp

@@ -7,12 +7,8 @@
 #include "tools.h"
 #include "password.h"
 #include <kcombobox.h>
-
-/*
-#include <klineedit.h>
-#include <khistorycombobox.h>
-#include <kcompletion.h>
-*/
+#include <signal.h>
+#include <QTextStream>
 
 using namespace std;
 
@@ -1622,12 +1618,61 @@ void MainWindow::on_actionHiddenService_triggered()
 
 void MainWindow::on_treeWidget_itemDoubleClicked(QTreeWidgetItem *item, int column)
 {
-	void();
+	(void) item;
+	(void) column;
 }
 
 
 void MainWindow::on_treeWidget_doubleClicked(const QModelIndex &index)
 {
-	void();
+	(void) index;
 }
 
+
+void MainWindow::on_actionPause_downloads_triggered()
+{
+	quint64 processID = this->downloading.process->processId();
+	QString fileStr = "/proc/" + QString::number(processID) + "/task/" + QString::number(processID) + "/children";
+	static QMessageBox *msgBox;
+
+	info (DEBUGMACRO, "downloading state : " + QString::fromUtf8((this->downloading.paused==0)?"running":"paused"));
+	info (DEBUGMACRO, "Downloading process ID : " + QString::number(processID));
+	info (DEBUGMACRO, fileStr);
+
+	QFile file(fileStr);
+	if(!file.open(QIODevice::ReadOnly))
+	{
+		QMessageBox::information(0, "error", file.errorString());
+	}
+
+	QTextStream in(&file);
+	QString children = in.readLine();
+	info (DEBUGMACRO, "Child process is : " + children);
+	if (this->downloading.paused)
+	{
+		info(DEBUGMACRO, "resuming Download");
+		if (kill(children.toLongLong(), SIGCONT))
+		{
+			info(DEBUGMACRO, "resuming failed : " + QString::number(errno));
+		}
+
+		msgBox->close();
+		this->downloading.paused = false;
+	}else
+	{
+		info(DEBUGMACRO, "pausing Download");
+		if (kill(children.toLongLong(), SIGTSTP))
+		{
+			info(DEBUGMACRO, "resuming failed : " + QString::number(errno));
+		}
+		msgBox = new QMessageBox(this);
+		msgBox->setIcon( QMessageBox::Warning );
+		msgBox->setText("Download suspended");
+		//QPushButton *btnCancel =  msgBox->addButton( "Cancel", QMessageBox::RejectRole );
+		msgBox->setAttribute(Qt::WA_DeleteOnClose); // delete pointer after close
+		msgBox->setModal(false);
+		msgBox->show();
+
+		this->downloading.paused = true;
+	}
+}